Treatment of casing unscrewing in ZK27A07 hole of Baijian Iron Mine

LIU Jiang; NIE Xinming; WANG Leihao; YIN Miao and SHI Xun; ${author.authorNameEn}

doi:10.12143/j.ztgc.2022.06.011

2022 Vol. 49, No. 6

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Article navigation > DRILLING ENGINEERING > 2022 > 49(6): 79-86

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LIU Jiang, NIE Xinming, WANG Leihao, YIN Miao and SHI Xun, . 2022. Treatment of casing unscrewing in ZK27A07 hole of Baijian Iron Mine. DRILLING ENGINEERING, 49(6): 79-86. doi: 10.12143/j.ztgc.2022.06.011

Citation:

LIU Jiang, NIE Xinming, WANG Leihao, YIN Miao and SHI Xun, . 2022. Treatment of casing unscrewing in ZK27A07 hole of Baijian Iron Mine. DRILLING ENGINEERING, 49(6): 79-86. doi: 10.12143/j.ztgc.2022.06.011

Treatment of casing unscrewing in ZK27A07 hole of Baijian Iron Mine

1.No.9 Geology Team, Hebei Provincial Bureau of Geology and Mineral Resources, Xingtai Hebei 054000, China;
2.Hebei Geological Exploration Institute of Sinochem General Administration of Geology and Mines,Shijiazhuang Hebei 050031, China

Received Date: 20 May 2022

Revised Date: 15 July 2022

Abstract

Abstract

Two large karst caves containing confined water were encountered during drilling of ZK27A07 borehole for Baijian iron ore exploration in Shahe City， Hebei Province. In the placement process of ?89mm casing， the casing unscrewed and fell downhole. In the process of accident treatment， the casing fell downhole again， with fishing tools breakingoken and falling downhole for several times， forming a superposition of multiple movable accident heads in the karst cave. We successfully handled the casing falling accident by casting concrete and natural by-pass drilling， so as to avoid scrapping the drilling hole. In this paper， the whole process of accident treatment is described in detail. Through careful analysis of the process and causes of the accident， the specific method is presented for safe placement of the casing string with excessive length and overweight. At the same time， how to realize reliable borehole wall sealing with the casing string in drilling through multiple karst caves containing confined water is discussed， which is intended to provide reference for similar projects.
- karst cave formation with confined water /
- casing unscrewing accident /
- casing sealing /
- natural by-pass /
- accident treatment

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References

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